I've always understood inflation to be linked to individual currencies, although my only research into the subject was an intro economics course in undergrad and I don't recall seeing why that would be the case.
I guess the basic principalprinciple is that currency traders are watching the printing presses and trading in exchange markets to the point that the exchange rates fall in relation to increases in money supply. There's probably something about the carry trade in there as well, but it's late and I took some medications, so someone else will have to carry that torch.
I must admit I've not really paid attention to foreign currencies like HKD, but the proximity and political relationship with China probably greatly complicates your question, since part of the problem has been China's currency peg.